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Once, I cut off a man's head, but he did not know it until he tried to brush his hair. Then it fell off.

George R. R. Martin (2012). “George R. R. Martin's A Game of Thrones 5-Book Boxed Set (Song of Ice and Fire Series): A Game of Thrones, A Clash of Kings, A Storm of Swords, A Feast for Crows, and and A Dance with Dragons”, p.1011, Bantam
Once, I cut off a man's head, but he did not know it until he tried to brush his hair. Then it fell off.